Siemens 6AV6355-1AA47-7EP2 OP 77A

€ 1.722,53

SKU: 6AV6355-1AA47-7EP2 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens 6AV6355-1AA47-7EP2 is an operator panel belonging to the SIMATIC HMI OP 77A series, manufactured by Siemens. It is a compact, key-operated operator panel designed for machine-level human-machine interface applications, providing operators with a straightforward means of monitoring and controlling industrial processes. This unit is part of the SIMATIC HMI Basic Panels generation and is intended for use with Siemens SIMATIC S7 controllers.

The OP 77A features a monochrome LCD display with a resolution of 160 x 80 pixels, providing clear text and basic graphic visualization. It supports MPI and PROFIBUS DP communication interfaces, enabling direct connection to SIMATIC S7-200, S7-300, and S7-400 PLCs without the need for additional gateways. The panel includes a membrane keypad with function keys for operator input, and is configured using WinCC flexible software. It operates on a 24 V DC supply and is rated IP65 on the front face, making it suitable for panel-mounted installations in industrial environments.

The OP 77A is widely used in manufacturing, machine building, and process automation applications where a cost-effective, reliable operator interface is required at the machine level. Its compact form factor and robust construction make it suitable for integration into control cabinets and machine panels in industries such as automotive, food and beverage, packaging, and general factory automation. The direct PROFIBUS DP and MPI connectivity simplifies system architecture in existing Siemens-based automation installations.

Technical Specifications

Display Type	Monochrome LCD
Display Resolution	160 x 80 pixels
Input Voltage	24 V DC
Communication Interface	MPI, PROFIBUS DP
IP Rating (Front)	IP65
IP Rating (Rear)	IP20
Operating Temperature	0 °C to +50 °C
Storage Temperature	-20 °C to +60 °C
Relative Humidity	10% to 90% (non-condensing)
Configuration Software	WinCC flexible 2005 or higher
Mounting	Panel mounting
Certifications	CE, UL
Series	SIMATIC HMI OP 77A

Common Error Codes & System Events

Event ID: 1003: Communication error between the HMI panel and the connected PLC. The panel cannot establish or maintain a connection to the controller.
Check MPI or PROFIBUS DP cable connections and termination resistors. Verify the PLC address settings and baud rate configuration in WinCC flexible match the controller settings.
Event ID: 1004: Connection to the PLC has been interrupted during runtime operation.
Inspect physical communication cables for damage or loose connectors. Verify PLC is powered and in RUN mode. Check for address conflicts on the MPI or PROFIBUS network.
Event ID: 10000: System startup error. The panel failed to complete its boot sequence correctly.
Perform a power cycle. If the error persists, check the 24 V DC supply voltage is within specification and reload the project using WinCC flexible.
Event ID: 10001: Project data is missing or corrupted on the panel.
Reload the project from the engineering PC using WinCC flexible. Ensure the correct project version is transferred to the device.
Event ID: 20000: Tag read error. The panel is unable to read the value of a configured tag from the PLC.
Verify the PLC data block and address referenced in the WinCC flexible project exist and are accessible. Check PLC program for address changes.
Event ID: 20001: Tag write error. The panel is unable to write a value to the configured PLC tag.
Check that the target PLC data area is not write-protected. Verify the tag address in the WinCC flexible project matches the PLC program.
Event ID: 40000: Operating system error detected on the HMI panel.
Perform a controlled restart of the panel. If the fault recurs, consider performing a factory reset and reloading the project firmware and configuration.

Frequently Asked Questions

Which PLCs are compatible with the OP 77A?

The OP 77A is compatible with Siemens SIMATIC S7-200, S7-300, and S7-400 PLCs via MPI or PROFIBUS DP interfaces. It can also communicate with S7-200 via PPI protocol.

What software is used to configure the OP 77A?

The OP 77A is configured using Siemens WinCC flexible 2005 or a later version. Projects are transferred to the panel via MPI cable or a PC adapter.

What is the supply voltage for the 6AV6355-1AA47-7EP2?

The panel requires a 24 V DC power supply. Ensure the supply is within the specified tolerance range to guarantee reliable operation.

What is the front panel protection rating of the OP 77A?

The front face of the OP 77A is rated IP65, providing protection against dust ingress and low-pressure water jets, making it suitable for panel-mounted industrial installations.

Can the OP 77A be used as a replacement for older Siemens OP panels?

The OP 77A is designed as a successor to earlier SIMATIC HMI operator panels such as the OP7 and OP17. Existing projects may require migration using WinCC flexible before transfer to the OP 77A.

Troubleshooting

Display remains blank after power is applied

Check the 24 V DC supply voltage at the power connector on the rear of the panel using a multimeter. Verify polarity is correct and voltage is within specification.

Correct any wiring errors or supply voltage issues. If the supply is confirmed good and the display remains blank, the internal power supply or display backlight may have failed and the unit should be sent for repair or replacement.

Panel displays communication error at startup and cannot connect to PLC

Verify the MPI or PROFIBUS DP cable is correctly connected and terminated at both ends. Check that the PLC address and baud rate configured in WinCC flexible match the actual PLC settings.

Correct the communication parameters in the WinCC flexible project and retransfer to the panel. Replace the communication cable if physical damage is found. Ensure termination resistors are correctly placed on the network.

Keypad buttons are unresponsive or intermittently fail to register input

Inspect the membrane keypad for physical damage, contamination, or wear. Test each key systematically in the panel's service or test mode if available.

Clean the keypad surface with a dry cloth. If individual keys have failed due to wear or damage, the membrane keypad assembly should be replaced by a qualified technician.

Project fails to transfer from engineering PC to the panel

Check the PC adapter or MPI cable connection between the PC and the panel. Verify the correct COM port and transfer settings are selected in WinCC flexible.

Try a different USB or MPI adapter if available. Ensure WinCC flexible is set to the correct baud rate and interface. Place the panel in transfer mode before initiating the download from the PC.

Panel reboots repeatedly or does not complete startup

Check for unstable 24 V DC supply voltage, particularly under load. Inspect for any error messages displayed briefly during the boot sequence.

Stabilize the power supply and ensure adequate current capacity. If the issue persists, perform a factory reset on the panel and reload the firmware and project. If rebooting continues, the unit may have a hardware fault requiring professional repair.

Condition	Repair, Used, Refurbished, New in box (sealed)